Ash.
-A scene where they try to flush the alien out of the airlock
early in the movie was partially filmed but cut.
-A longer version of Brett's death.
-After Kane dies the crew meets up and suggests cataching the creature.
-Ripley finds Dallas still alive but cocooned similar to the scenes witht he cocoons in Aliens.
-A scene where they look at the x-ray and Dallas asks "what is that dark spot on his lungs"
-A rumored love scene was never filmed but supposedly took place in some kind of bubble type thing.
-Originally when the crew woke up from hybernation, they were naked.I'm not sure if it was filmed or not.